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Table 1 Basic characteristics at baseline for all patients and for patients with more than one substance use measurement (numbers (n) and percentages (%))

From: Changes in substance use during outpatient treatment for substance use disorders: a prospective Norwegian cohort study from 2016 to 2020

  All
patients
(N = 708)
Patients with
> 1 substance use measurement
(N = 171)
Age (years), n (%)
 18–30 84 (12) 11 (6)
 30–40 204 (29) 43 (25)
 40–50 215 (30) 57 (33)
 50–60 164 (23) 47 (27)
 ≥ 60 41 (6) 13 (8)
 Mean (SD) 43 (11) 46 (10)
Gender, n (%)
 Male 514 (73) 130 (76)
 Female 194 (27) 41 (24)
Highest education level, n (%)
 Not completed primary school 39 (6) 11 (6)
 Completed primary school (9 years) 306 (44) 77 (45)
 Completed high school (12 years) 277 (40) 66 (39)
 ≤ 3 years of college or university 58 (8) < 15 (< 10)
 > 3 years of college or university 14 (2) < 15 (< 10)
Injected substances during the past 6 months, n (%) 384 (54) 82 (48)
Unstable housing situation during the past 30 daysa, n (%) 86 (12) 5 (4)
Substance use during the past 12 monthsb, n (%)
 Alcohol 513 (72) 113 (66)
 Benzodiazepines 489 (69) 126 (74)
 Cannabis 537 (76) 133 (78)
 Opioids 344 (49) 75 (44)
 Stimulants (amphetamines and cocaine) 451 (64) 103 (60)
Inpatient detoxification, n (%) 35 (20)
Received OAT, n (%) 553 (78) 166 (97)
Received municipality care, n (%) 155 (22) 5 (3)
Comorbidities, n (%)
 Hepatitis C virus infection 349 (60) 89 (57)
 Hepatitis B virus infection 5 (< 1) < 5 (< 5)
 Human immunodeficiency virus infection < 5 (< 5) < 5 (< 5)
  1. SD Standard deviation
  2. aAn unstable housing situation was defined as living in a homeless shelter or with family or friends at any time during the past 30 days. Having owned or rented housing situation or being imprisoned were defined as a stable housing situation
  3. bThe number of patients who have used substances at least once during the past 12 months